Recently, many people in the community have been discussing the problem of losing private keys—this is indeed a very real concern. A number of users, after using hot wallets, have lost their mnemonic phrases due to poor management, and their assets are gone. So more and more people are starting to pay attention to cold wallets as a solution.

What exactly is a cold wallet? Put simply, it stores your private key on an offline device, such as a hardware wallet or a paper wallet. Unlike hot wallets, which are online—convenient but risky—cold wallets are like locking your money in a safe, with clearly higher security.

The working principle of a cold wallet is actually not complicated. First, it helps you generate a pair of public and private keys. Your public key is your address, which you can share publicly so others can send you funds. Your private key is like your password—you must never let it leak. Also, there’s the mnemonic phrase, which uses 12 or 24 English words to represent the private key, making it easier to remember. The key is that all of these are stored on an offline device, so hackers and malicious software can’t even access them.

Currently, there are several hardware wallets that are relatively popular on the market. Ledger Nano X is from France; it supports more than 5,500 coins and costs $149. Trezor Safe 5 is a product from Czech Republic; it has a touchscreen, supports more than 1,000 coins, and costs $169. There’s also SafePal S1 Pro, which supports over 30,000 coins, and is the cheapest—about $90.

When choosing a cold wallet, you should look at a few aspects. First is security—this is the core. Look for products with strong encryption and multi-factor verification. Next is compatibility: make sure it supports the coins you hold. Then consider cost—being the most expensive doesn’t necessarily mean it’s the best; the key is cost-effectiveness. Finally, don’t ignore user experience. A good interface can make it easier for you to manage your assets.

How do you use a cold wallet? If you don’t yet have a public-private key pair, create one first. When you need to make a transaction, connect the cold wallet to your phone or computer, enter your PIN to unlock, and initiate the transaction. Verify the transaction details on the device—once confirmed correct, you’re good to go. After the transaction is completed, disconnect immediately so the private key returns to an offline state, making it much more secure. However, be careful not to connect to unknown DApps casually, otherwise you lose the advantages of a cold wallet. One more suggestion: although hardware wallets are quite durable, it’s best to back up the private key and mnemonic phrase on paper or a USB drive as well.

Speaking of the difference between cold wallets and hot wallets, it’s fairly clear. A cold wallet stores assets offline, offering high security but more complicated operation, making it suitable for holding coins long-term. A hot wallet operates online—very convenient but with relatively higher risk—so it’s suitable for frequent trading. In terms of fees, cold wallets require purchasing hardware, usually $50 to $500, while hot wallets are generally free.

Based on market data, the number of users of crypto wallets is growing rapidly. The hardware wallet market is also expanding: in 2021, it was already at a scale of $400 million, and it is expected to reach $3.6 billion by 2032. As demand increases, more developers are entering this space, intensifying competition. This is actually a good thing—because in order to capture market share, manufacturers will continuously improve security, support more coins, and lower prices.

Overall, if you’re someone who holds coins long-term—especially with a relatively large asset size—the difference between cold wallets and hot wallets becomes evident. Cold wallets may be relatively more complex to operate, but their security is truly reliable. There are many options now too, so you can choose based on your needs and budget.